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27 cannot backproject from compressed image #32

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Merged
den-sq merged 2 commits into from
Sep 25, 2025
Merged

27 cannot backproject from compressed image #32

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a1b09ef
Addresses Cannot Backproject from Compressed Image
den-sq Sep 25, 2025
0d3adee
Expand check to tiff stacks
den-sq Sep 25, 2025
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13 changes: 12 additions & 1 deletion python/ouroboros/pipeline/backproject_pipeline.py
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Original file line number Diff line number Diff line change
Expand Up @@ -96,7 +96,18 @@ def _process(self, input_data: any) -> tuple[any, None] | tuple[None, any]:
is_compressed = bool(tif.pages[0].compression)
FPShape = FrontProjStack(D=len(tif.pages), V=tif.pages[0].shape[0], U=tif.pages[0].shape[1])

if is_compressed:
cannot_memmap = False
try:
if Path(straightened_volume_path).is_dir():
_ = tifffile.memmap(next(Path(straightened_volume_path).iterdir()), mode="r")
else:
_ = tifffile.memmap(straightened_volume_path, mode="r")
except: # noqa: E722
# Check here is because memmap needs certain types of dataoffsets, which aren't always there
# separate to compression.
cannot_memmap = True

if is_compressed or cannot_memmap:
print("Input data compressed; Rewriting.")

# Create a new path for the straightened volume
Expand Down